25mm Rectangular Hollow Steel Tubing Q235 Low Carbon Black Steel Hot Dip

Product Specification

Q235 Low Carbon Black Steel Hot Dip Galvanized Coating Square Tube/Rectangular Hollow Pipe

The basic concept
Rectangular tube is a kind of hollow square cross section light thin wall steel tube, also known as steel refrigeration bend section. It is made of Q235 hot rolled or cold rolled strip steel or coil plate as base material by cold bending forming and then by high frequency welding made of square section shape and size of steel. In addition to the thickening of the wall, the corner size and edge flatness of hot rolled extra-thick wall square tube reach or even exceed the level of resistance welding cold forming square tube.
classification
Classification of rectangular tubes: steel tubes are divided into seamless tubes and welded tubes (welded tubes) hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes and welded square tubes. The welding square pipe is divided into: 1. According to the process, it is divided into arc welding square pipe, resistance welding square pipe (high frequency, low frequency), gas welding square pipe, furnace welding square pipe; 2, according to the weld - straight seam welding square pipe, spiral welding square pipe.
use
Construction, machinery manufacturing, steel construction projects, shipbuilding, solar power support, steel structure engineering, electric power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, etc.
Matters needing attention
Q345 seamless rectangular tube utilization rate is very high, but the general construction party in the construction before, the pipe, pipe fittings, rubber ring, etc., do a appearance inspection, found that there is a problem to give up the use. 1, clean up Q345 seamless tube mouth: clean up all the sundries in the mouth. 2. Clean the rubber ring and upper rubber ring: clean the adhesive on the rubber ring, put the rubber ring into the socket groove by bending the "plum shape" or figure 8, press the whole rubber ring by hand, or hit it with a rubber hammer to ensure that each part of the rubber ring is not warped or twisted, evenly stuck in the groove. 3, on the outer surface of the socket and the rubber ring coated with lubricant: the lubricant is evenly coated on the inner surface of the rubber ring installed at the socket, and when the lubricant is coated on the outer surface of the socket, all the parts of the socket outside the socket line should be brushed evenly. 4. Pipe down: Q345 seamless rectangular pipe should be lowered to the bottom of the groove according to the requirements of the pipe down, usually using manual pipe down method or mechanical pipe down method. 5, installation of machinery and equipment: the prepared machinery and equipment will be installed in place, pay attention to the installation of Q345 seamless rectangular pipe has been cleaned again pollution. 6. Push Q345 seamless torque tube to insert into the socket: during installation, in order to insert the socket into the socket is more labor-saving and smooth. First of all, put the socket into the socket and press the socket to the rubber ring in the socket, connect the wire rope and inverted chain, pull the inverted chain; Until the socket is fully inserted into the socket, there should be a 2mm gap between the socket and the socket, and ensure that the distance from the outer edge of the socket to the rubber ring is consistent. In the installation process, the fixed pipe and the moving pipe should be in a straight line, otherwise it is easy to push out the rubber ring, affecting the quality and speed of installation. Q345 seamless torque tube installation should be flat, Q345 seamless torque tube should be in a straight line, in case of tilt Angle, be careful. Align the interface connecting Q345 seamless torque tube with the socket. If the insertion resistance is too large, do not forcibly insert it to prevent the rubber ring from twisting. Rubber ring lubricating oil should use vegetable oil; In cold winter, the rubber ring can be preheated with hot water to reduce hardness and install quickly.